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FFH scientific research papers database
FFH database search (1991-2022):
1581.
Vidić, J; Sužnjević, D; Erceg, M; Vučelić, D
Adsorption behaviour of insulin and soybean trypsin inhibitor at the mercury | solution interface Journal Article
In: Journal of Electroanalytical Chemistry, vol. 452, no. 2, pp. 151-159, 1998.
@article{Vidić1998151,
title = {Adsorption behaviour of insulin and soybean trypsin inhibitor at the mercury | solution interface},
author = {J Vidić and D Sužnjević and M Erceg and D Vučelić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032119168&doi=10.1016%2fS0022-0728%2898%2900110-7&partnerID=40&md5=86508cf74174ff4c5243ef0ab5829d22},
doi = {10.1016/S0022-0728(98)00110-7},
year = {1998},
date = {1998-01-01},
journal = {Journal of Electroanalytical Chemistry},
volume = {452},
number = {2},
pages = {151-159},
abstract = {The adsorption of insulin and soybean trypsin inhibitor (STI) on the mercury electrode was investigated with phase-sensitive alternating current (ac) polarography. The investigations focused on the effect of insulin and STI concentrations on the capacitive ac component over a wide potential range at pH 8.8, when both proteins are in folded form, and at pH 1.0 when they are unfolded. Besides a pseudo-capacitance due to the faradaic process of protein -S-S- bond reduction, the presence of protein adsorption of the Frumkin type was established. From the analysis of the corresponding adsorption isotherms, the relevant thermodynamic adsorption parameters were determined. Similarities in the adsorption characteristics of both proteins studied were demonstrated, and the differences in the adsorption behaviour between native and denatured proteins were proven. The data obtained is also discussed from the aspect of protein disulphide bond interaction with mercury. © 1998 Elsevier Science S.A. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The adsorption of insulin and soybean trypsin inhibitor (STI) on the mercury electrode was investigated with phase-sensitive alternating current (ac) polarography. The investigations focused on the effect of insulin and STI concentrations on the capacitive ac component over a wide potential range at pH 8.8, when both proteins are in folded form, and at pH 1.0 when they are unfolded. Besides a pseudo-capacitance due to the faradaic process of protein -S-S- bond reduction, the presence of protein adsorption of the Frumkin type was established. From the analysis of the corresponding adsorption isotherms, the relevant thermodynamic adsorption parameters were determined. Similarities in the adsorption characteristics of both proteins studied were demonstrated, and the differences in the adsorption behaviour between native and denatured proteins were proven. The data obtained is also discussed from the aspect of protein disulphide bond interaction with mercury. © 1998 Elsevier Science S.A. All rights reserved.
1582.
Šašić, S; Kuzmanović, M
Raman Spectroscopic Study of Acetone-Phenol Mixtures Journal Article
In: Journal of Raman Spectroscopy, vol. 29, no. 7, pp. 592-599, 1998.
@article{Šašić1998592,
title = {Raman Spectroscopic Study of Acetone-Phenol Mixtures},
author = {S Šašić and M Kuzmanović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0542451810&partnerID=40&md5=d690d7d5da7d33d863035bd9a82c6d98},
year = {1998},
date = {1998-01-01},
journal = {Journal of Raman Spectroscopy},
volume = {29},
number = {7},
pages = {592-599},
abstract = {Acetone-phenol mixtures with phenol mole fractions in the range 0.079-0.6000 were studied by Raman spectroscopy. Spectra were obtained in the regions of acetone C=O stretching and C-C symmetric stretching bands. Principal factor analysis applied to the set of C=O stretching bands revealed two independent components belonging to free and hydrogen-bonded acetone. Interaction with phenol produces a new band at a lower wavenumber in the C=O vibration region and an additional band at a higher wavenumber in the C-C symmetric stretch region. These changes were explained by charge delocalization induced by the hydrogen bond. On applying band deconvolution and target factor analysis, it was deduced that the equilibrium constant K of 1:1 acetone-phenol complex formation is too high to be determined by Raman spectroscopy in the range 0.079-0.400 mole fraction of phenol. At equal mole fractions of acetone and phenol, values of K = 2.61 and 3.22 dm 3 mol -1 were obtained by deconvolution and target factor analysis, respectively. An investigation of ternary solutions with an inert solvent showed no significant differences in acetone-phenol interaction between this system and binary mixtures. © 1998 John Wiley & Sons, Ltd.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Acetone-phenol mixtures with phenol mole fractions in the range 0.079-0.6000 were studied by Raman spectroscopy. Spectra were obtained in the regions of acetone C=O stretching and C-C symmetric stretching bands. Principal factor analysis applied to the set of C=O stretching bands revealed two independent components belonging to free and hydrogen-bonded acetone. Interaction with phenol produces a new band at a lower wavenumber in the C=O vibration region and an additional band at a higher wavenumber in the C-C symmetric stretch region. These changes were explained by charge delocalization induced by the hydrogen bond. On applying band deconvolution and target factor analysis, it was deduced that the equilibrium constant K of 1:1 acetone-phenol complex formation is too high to be determined by Raman spectroscopy in the range 0.079-0.400 mole fraction of phenol. At equal mole fractions of acetone and phenol, values of K = 2.61 and 3.22 dm 3 mol -1 were obtained by deconvolution and target factor analysis, respectively. An investigation of ternary solutions with an inert solvent showed no significant differences in acetone-phenol interaction between this system and binary mixtures. © 1998 John Wiley & Sons, Ltd.
1583.
Šašić, S; Jeremić, M; Antić-Jovanović, A
Raman Study of Solvent-Solute Interactions in Solutions of Mercury(II)-Thiocyanate Complexes Journal Article
In: Journal of Raman Spectroscopy, vol. 29, no. 4, pp. 321-325, 1998.
@article{Šašić1998321,
title = {Raman Study of Solvent-Solute Interactions in Solutions of Mercury(II)-Thiocyanate Complexes},
author = {S Šašić and M Jeremić and A Antić-Jovanović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0542404156&doi=10.1002%2f%28SICI%291097-4555%28199804%2929%3a4%3c321%3a%3aAID-JRS244%3e3.0.CO%3b2-Q&partnerID=40&md5=b3c05d6c9c4348f96b7d075c21174469},
doi = {10.1002/(SICI)1097-4555(199804)29:4<321::AID-JRS244>3.0.CO;2-Q},
year = {1998},
date = {1998-01-01},
journal = {Journal of Raman Spectroscopy},
volume = {29},
number = {4},
pages = {321-325},
abstract = {Raman spectra of the Hg(SCN)2, [Hg(SCN)3]- and [Hg(SCN)4]2- complex species in solution were investigated for 10 donor solvents in the v(CN) and v(CS) wavenumber regions. Attempts were made to relate the solvent donor strength to overall vibrational properties of the complexes. A good correlation of v(CN) with v(HgS) and consequently with solvent donor properties was found in solutions Of Hg(SCN)2 and [Hg (SCN)3]-. Wavenumber differences Δṽ(CN), calculated as the difference between wavenumbers of coordinated and free SCN- ligands, correlate well with the solvent donor strength scale, Ds. The Δv(CN) values for Hg(SCN)2 and [Hg(SCN)3]- can be used as an indicator of solvent donor capacity. Data derived from the Δv(CN) shifts show a better correlation with solvent donor ability than those obtained from the v(CS) wavenumber. The spectral properties of [Hg(SCN)4]2- complex depend only on the electrophilic properties of the solvent and not on its donor strength, because solvent molecules cannot penetrate into the first coordination sphere and donate an electron pair to Hg(II). Solvent electrophilic interaction with coordinated thiocyanate is proportional to its acceptor number.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Raman spectra of the Hg(SCN)2, [Hg(SCN)3]- and [Hg(SCN)4]2- complex species in solution were investigated for 10 donor solvents in the v(CN) and v(CS) wavenumber regions. Attempts were made to relate the solvent donor strength to overall vibrational properties of the complexes. A good correlation of v(CN) with v(HgS) and consequently with solvent donor properties was found in solutions Of Hg(SCN)2 and [Hg (SCN)3]-. Wavenumber differences Δṽ(CN), calculated as the difference between wavenumbers of coordinated and free SCN- ligands, correlate well with the solvent donor strength scale, Ds. The Δv(CN) values for Hg(SCN)2 and [Hg(SCN)3]- can be used as an indicator of solvent donor capacity. Data derived from the Δv(CN) shifts show a better correlation with solvent donor ability than those obtained from the v(CS) wavenumber. The spectral properties of [Hg(SCN)4]2- complex depend only on the electrophilic properties of the solvent and not on its donor strength, because solvent molecules cannot penetrate into the first coordination sphere and donate an electron pair to Hg(II). Solvent electrophilic interaction with coordinated thiocyanate is proportional to its acceptor number.
1584.
Perić, M; Radić-Perić, J
Ab initio investigation of the vibronic structure and the spin-orbit coupling in the X2Πu state of C2D2 + Journal Article
In: Chemical Physics Letters, vol. 290, no. 4-6, pp. 443-450, 1998.
@article{Perić1998443,
title = {Ab initio investigation of the vibronic structure and the spin-orbit coupling in the X2Πu state of C2D2 +},
author = {M Perić and J Radić-Perić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0039500669&doi=10.1016%2fS0009-2614%2898%2900521-1&partnerID=40&md5=6b5679ce99d8e7687a00fb1ce9d9aba8},
doi = {10.1016/S0009-2614(98)00521-1},
year = {1998},
date = {1998-01-01},
journal = {Chemical Physics Letters},
volume = {290},
number = {4-6},
pages = {443-450},
abstract = {Results of an ab initio study of the Renner-Teller effect in the X2Πu state of C2D2 + are presented. Potential curves for the trans- and cis-bending vibrations calculated by means of the internally contracted multireference configuration interaction method are employed. Vibronic energy levels and their splitting upon spin-orbit coupling are computed by means of a variational approach. © 1998 Elsevier Science B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Results of an ab initio study of the Renner-Teller effect in the X2Πu state of C2D2 + are presented. Potential curves for the trans- and cis-bending vibrations calculated by means of the internally contracted multireference configuration interaction method are employed. Vibronic energy levels and their splitting upon spin-orbit coupling are computed by means of a variational approach. © 1998 Elsevier Science B.V. All rights reserved.
1585.
Ignjatović, L M; Veselinović, D S; Marković, D A; Vukelić, N S
Adsorptive stripping voltammetric determination of the herbicides atrazine and ametryne Journal Article
In: Journal of the Serbian Chemical Society, vol. 63, no. 1, pp. 75-84, 1998.
@article{Ignjatović199875,
title = {Adsorptive stripping voltammetric determination of the herbicides atrazine and ametryne},
author = {L M Ignjatović and D S Veselinović and D A Marković and N S Vukelić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032354618&partnerID=40&md5=f95ff508872640e4c011577696e16a41},
year = {1998},
date = {1998-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {63},
number = {1},
pages = {75-84},
abstract = {The optimum conditions were established for the determination of the herbicides atrazine and ametryne by differential-pulse voltammetry at a hanging mercury drop electrode in the concentration range from 1×10 -5 to 1×10 -7 mol dm -3 using a supporting electrolyte at pH 3.0. The sensitivity of the determination can be improved through adsorptive accumulation of the investigated substances on the surface of the hanging mercury drop electrode: differential-pulse adsoprtive stripping voltammetry enables the determination of atrazine (at pH 3.0) and ametryne (at pH 3.0 and 5.0) in the concentration range from 1×10 -7 to 1×10 -9 mol dm -3 . The method described is selective: the herbicides under study can be determined in their mixture according to the dependence of the peak current on pH. The procedure was applied to the selective determination of atrazine and ametryne in various standard solutions, with results of satisfactory accuracy and precision. Recoveries were 97.5-105%.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The optimum conditions were established for the determination of the herbicides atrazine and ametryne by differential-pulse voltammetry at a hanging mercury drop electrode in the concentration range from 1×10 -5 to 1×10 -7 mol dm -3 using a supporting electrolyte at pH 3.0. The sensitivity of the determination can be improved through adsorptive accumulation of the investigated substances on the surface of the hanging mercury drop electrode: differential-pulse adsoprtive stripping voltammetry enables the determination of atrazine (at pH 3.0) and ametryne (at pH 3.0 and 5.0) in the concentration range from 1×10 -7 to 1×10 -9 mol dm -3 . The method described is selective: the herbicides under study can be determined in their mixture according to the dependence of the peak current on pH. The procedure was applied to the selective determination of atrazine and ametryne in various standard solutions, with results of satisfactory accuracy and precision. Recoveries were 97.5-105%.
1586.
Šašić, S
Quantitative analysis of overlapped Raman spectra by target factor analysis and evolving factor analysis Journal Article
In: Analyst, vol. 123, no. 6, pp. 1193-1197, 1998.
@article{Šašić19981193,
title = {Quantitative analysis of overlapped Raman spectra by target factor analysis and evolving factor analysis},
author = {S Šašić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031812548&doi=10.1039%2fa800019k&partnerID=40&md5=2ea328ec297f01be700aa67e23d2060a},
doi = {10.1039/a800019k},
year = {1998},
date = {1998-01-01},
journal = {Analyst},
volume = {123},
number = {6},
pages = {1193-1197},
abstract = {A system of overlapped Raman spectra was formed on the basis of three experimentally recorded basic bands and quantitatively analysed by two statistical methods: target factor analysis (TFA) and evolving factor analysis (EFA). The results were compared with one another and with the true values. For intense bands, the values obtained by both methods were in good agreement with the expected values, while for small shoulders of strong bands quantitative analysis by EFA apparently gave better results than TFA.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A system of overlapped Raman spectra was formed on the basis of three experimentally recorded basic bands and quantitatively analysed by two statistical methods: target factor analysis (TFA) and evolving factor analysis (EFA). The results were compared with one another and with the true values. For intense bands, the values obtained by both methods were in good agreement with the expected values, while for small shoulders of strong bands quantitative analysis by EFA apparently gave better results than TFA.
1587.
Ciric-Marjanovic, G; Mentus, S
Charge-discharge characteristics of polythiophene as a cathode active material in a rechargeable battery Journal Article
In: Journal of Applied Electrochemistry, vol. 28, no. 1, pp. 103-106, 1998.
@article{Ciric-Marjanovic1998103,
title = {Charge-discharge characteristics of polythiophene as a cathode active material in a rechargeable battery},
author = {G Ciric-Marjanovic and S Mentus},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031701528&doi=10.1023%2fA%3a1003210220871&partnerID=40&md5=1af60bae8f0f2def70fb3549b7c736c9},
doi = {10.1023/A:1003210220871},
year = {1998},
date = {1998-01-01},
journal = {Journal of Applied Electrochemistry},
volume = {28},
number = {1},
pages = {103-106},
abstract = {Polythiophene films were electrochemically deposited on glassy carbon substrates under potentiostatic control and used as cathode active material together with a Zn anode in a rechargeable battery with propylene carbonate, Zn(ClO4)2, LiClO4 electrolyte. Charge-discharge characteristics were studied. The average discharge voltage of the polythiophene/Zn cell was 1.25 V. In the low current density region (i.e. 10-50 μA cm-2) the cycling coulombic efficiency was above 95%, but in the fast charge-discharge region, where current densities were 0.1-0.5 mA cm-2, the coulombic efficiency decreased to 55% with increasing discharge rate. Additionally, it was found that the cyclic coulombic efficiency was a function of the charging depth.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Polythiophene films were electrochemically deposited on glassy carbon substrates under potentiostatic control and used as cathode active material together with a Zn anode in a rechargeable battery with propylene carbonate, Zn(ClO4)2, LiClO4 electrolyte. Charge-discharge characteristics were studied. The average discharge voltage of the polythiophene/Zn cell was 1.25 V. In the low current density region (i.e. 10-50 μA cm-2) the cycling coulombic efficiency was above 95%, but in the fast charge-discharge region, where current densities were 0.1-0.5 mA cm-2, the coulombic efficiency decreased to 55% with increasing discharge rate. Additionally, it was found that the cyclic coulombic efficiency was a function of the charging depth.
1588.
Lalić, M; Šašic, S; Antić-Jovanović, A; Jeremić, M
An investigation of the digitized Raman band profiles of aqueous Mg(ClO4)2 - NaSCN solutions Journal Article
In: Spectroscopy Letters, vol. 31, no. 2, pp. 335-346, 1998.
@article{Lalić1998335,
title = {An investigation of the digitized Raman band profiles of aqueous Mg(ClO4)2 - NaSCN solutions},
author = {M Lalić and S Šašic and A Antić-Jovanović and M Jeremić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0009711955&doi=10.1080%2f00387019808003258&partnerID=40&md5=5c4f7d46b05f603658a1ed319fe99569},
doi = {10.1080/00387019808003258},
year = {1998},
date = {1998-01-01},
journal = {Spectroscopy Letters},
volume = {31},
number = {2},
pages = {335-346},
abstract = {Raman spectra, together with factor analysis and band deconvolution procedure, have been used to study formation of magnesium thiocyanate complexes in aqueous solutions at ambient and elevated temperatures. The total salt concentration in solutions, containing different mole ratio of Mg2+ to SCN-, varied between 3.4 and 7.5 mol dm-3. Factor analyses indicated that two linearly independent scattering components in the band envelopes, recorded in the v1 and v3 stretching regions of SCN-, for all solutions with total salt concentration of 3.4 mol dm-3. The appearance of a pseudo-isosbestic point in the area normalized spectra supported this result, as well as the band resolution procedure. The latter revealed the third scattering component in the spectra of solutions with total salt concentration above 3.5 mol dm-3. Resolved components have been assigned to the free thiocyanate, the 1:1 and 1:2 magnesium thiocyanate complexes. The equilibrium constant KC of the 1:1 complex is of an order of 10-1mol dm-3.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Raman spectra, together with factor analysis and band deconvolution procedure, have been used to study formation of magnesium thiocyanate complexes in aqueous solutions at ambient and elevated temperatures. The total salt concentration in solutions, containing different mole ratio of Mg2+ to SCN-, varied between 3.4 and 7.5 mol dm-3. Factor analyses indicated that two linearly independent scattering components in the band envelopes, recorded in the v1 and v3 stretching regions of SCN-, for all solutions with total salt concentration of 3.4 mol dm-3. The appearance of a pseudo-isosbestic point in the area normalized spectra supported this result, as well as the band resolution procedure. The latter revealed the third scattering component in the spectra of solutions with total salt concentration above 3.5 mol dm-3. Resolved components have been assigned to the free thiocyanate, the 1:1 and 1:2 magnesium thiocyanate complexes. The equilibrium constant KC of the 1:1 complex is of an order of 10-1mol dm-3.
1589.
Sovilj, S P; Babić-Samardžija, K; Minić, D M
Synthesis and physicochemical characterization of the complex cis-[Co(acac)cyclam](ClO 4 ) 2 Journal Article
In: Journal of the Serbian Chemical Society, vol. 63, no. 12, pp. 979-985, 1998.
@article{Sovilj1998979,
title = {Synthesis and physicochemical characterization of the complex cis-[Co(acac)cyclam](ClO 4 ) 2},
author = {S P Sovilj and K Babić-Samardžija and D M Minić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0038854978&partnerID=40&md5=bb33b1af07cd896fcc3fa72d8fd49898},
year = {1998},
date = {1998-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {63},
number = {12},
pages = {979-985},
abstract = {A new cobalt(III) complex cis-[Co(acac)cyclam](ClO 4 ) 2 (cyclam = 1,4,8,11-tetraazacyclotetradecane},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A new cobalt(III) complex cis-[Co(acac)cyclam](ClO 4 ) 2 (cyclam = 1,4,8,11-tetraazacyclotetradecane
1590.
Kuntic, V; Kosanić, M; Malešev, D; Radović, Z; Mioč, U
Spectrophotometric investigation of the uranil(II)-hesperidin complex in 70% methanol Journal Article
In: Journal of the Serbian Chemical Society, vol. 63, no. 7, pp. 565-572, 1998.
@article{Kuntic1998565,
title = {Spectrophotometric investigation of the uranil(II)-hesperidin complex in 70% methanol},
author = {V Kuntic and M Kosanić and D Malešev and Z Radović and U Mioč},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0040115540&partnerID=40&md5=6afb7d53e5a4334aeffbd3006ac4ca2d},
year = {1998},
date = {1998-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {63},
number = {7},
pages = {565-572},
abstract = {The composition and stability constant of the UO2(II)-hesperidin complex were determined by suitable spectrophotometric methods and pH-metric measurements. It was found that the uranil ion and hesperidin form a 1:2 complex in which the uranil ion is linked to the hesperidin molecule through the carbonyl and the 5-hydroxyl group. The relative stability constant, log K 2 , ranged from 5.77 at pH 4.0 to 7.00 at pH 6.0. The conditions for the spectrophotometric determination of hesperidin, Dy means of reaction of the complex formation reaction, were investigated. Beer's law was obeyed up to 2.0x10 -5 mol dm -3 hesperidin.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The composition and stability constant of the UO2(II)-hesperidin complex were determined by suitable spectrophotometric methods and pH-metric measurements. It was found that the uranil ion and hesperidin form a 1:2 complex in which the uranil ion is linked to the hesperidin molecule through the carbonyl and the 5-hydroxyl group. The relative stability constant, log K 2 , ranged from 5.77 at pH 4.0 to 7.00 at pH 6.0. The conditions for the spectrophotometric determination of hesperidin, Dy means of reaction of the complex formation reaction, were investigated. Beer's law was obeyed up to 2.0x10 -5 mol dm -3 hesperidin.
1591.
Malinar, M J; Miodragović, Dj. U.; Milosavljević, S; Ćelap, M B; Vučelić, D
Mixed cobalt(III) complexes with S-tyrosine and 1,3-diaminopropane Journal Article
In: Enantiomer, vol. 3, no. 4-5, pp. 349-356, 1998.
@article{Malinar1998349,
title = {Mixed cobalt(III) complexes with S-tyrosine and 1,3-diaminopropane},
author = {M J Malinar and Dj.U. Miodragović and S Milosavljević and M B Ćelap and D Vučelić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032409344&partnerID=40&md5=70980818ca6de7fe19d6bd63012c6b91},
year = {1998},
date = {1998-01-01},
journal = {Enantiomer},
volume = {3},
number = {4-5},
pages = {349-356},
abstract = {Four out of six theoretically possible isomers of the (1,3-diaminopropane)bis(S-tyrosinato)cobalt(III) complex, having the cis(O) configuration, were isolated, and the trans(O) isomer was only defined in the eluate. The isomers were separated on an optically active Sephadex QAE column. Geometrical and absolute configurations of the isomers were determined by electronic absorption, circular dichroic and 1 H NMR spectra. The effect of the aromatic side group of the coordinated S-tyrosinato ligand on the stereoselective formation of the obtained isomers was examined.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Four out of six theoretically possible isomers of the (1,3-diaminopropane)bis(S-tyrosinato)cobalt(III) complex, having the cis(O) configuration, were isolated, and the trans(O) isomer was only defined in the eluate. The isomers were separated on an optically active Sephadex QAE column. Geometrical and absolute configurations of the isomers were determined by electronic absorption, circular dichroic and 1 H NMR spectra. The effect of the aromatic side group of the coordinated S-tyrosinato ligand on the stereoselective formation of the obtained isomers was examined.
1592.
Kuntić, V S; Malešev, D L; Radović, Z V; Kosanić, M M; Mioč, U B; Vukojević, V B
Spectrophotometric Investigation of Uranil(II)-Rutin Complex in 70% Ethanol Journal Article
In: Journal of Agricultural and Food Chemistry, vol. 46, no. 12, pp. 5139-5142, 1998.
@article{Kuntić19985139,
title = {Spectrophotometric Investigation of Uranil(II)-Rutin Complex in 70% Ethanol},
author = {V S Kuntić and D L Malešev and Z V Radović and M M Kosanić and U B Mioč and V B Vukojević},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0001715255&doi=10.1021%2fjf980376k&partnerID=40&md5=197954ad78ea77f4e88ee2d706c7c43f},
doi = {10.1021/jf980376k},
year = {1998},
date = {1998-01-01},
journal = {Journal of Agricultural and Food Chemistry},
volume = {46},
number = {12},
pages = {5139-5142},
abstract = {The composition and stability constant of a UO2(II)-rutin complex in 70% ethanol were determined by suitable spectrophotometric methods and pH measurement. UC2(II) ion and rutin (3,3′,4′,5,7-pentahydroxyflavone-3-rhamnoglucoside) form a 1:1 complex in which the UO2(II) ion is linked to rutin through the carbonyl and 5-hydroxyl group. The concentration stability constant of the complex, log β1, ranged from 6.57 at pH 4.00 to 4.72 at pH 7.00. Conditions for spectrophotometric determination of rutin, by complex formation with UO2(II) ion, were investigated. Beer's law was obeyed in the concentration range from 1.0 x 10-5 to 2.0 x 10-4 M for rutin. Determination of rutin in Rutinion forte tablets was demonstrated.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The composition and stability constant of a UO2(II)-rutin complex in 70% ethanol were determined by suitable spectrophotometric methods and pH measurement. UC2(II) ion and rutin (3,3′,4′,5,7-pentahydroxyflavone-3-rhamnoglucoside) form a 1:1 complex in which the UO2(II) ion is linked to rutin through the carbonyl and 5-hydroxyl group. The concentration stability constant of the complex, log β1, ranged from 6.57 at pH 4.00 to 4.72 at pH 7.00. Conditions for spectrophotometric determination of rutin, by complex formation with UO2(II) ion, were investigated. Beer's law was obeyed in the concentration range from 1.0 x 10-5 to 2.0 x 10-4 M for rutin. Determination of rutin in Rutinion forte tablets was demonstrated.
1593.
Stoiljković, M M; Holclajtner-Antunović, I; Pavlović, M S; Radak, B B
Determination of cesium, rubidium and lithium by stabilized DC arc plasma emission spectrometry Journal Article
In: Journal of the Serbian Chemical Society, vol. 63, no. 9, pp. 733-741, 1998.
@article{Stoiljković1998733,
title = {Determination of cesium, rubidium and lithium by stabilized DC arc plasma emission spectrometry},
author = {M M Stoiljković and I Holclajtner-Antunović and M S Pavlović and B B Radak},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032372035&partnerID=40&md5=c1449cafc9bded379ce4ec915a07c74f},
year = {1998},
date = {1998-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {63},
number = {9},
pages = {733-741},
abstract = {Optimization of the conditions for the analytical application of a vertical argon stabilized DC are plasma, seeded by an easily ionizable element, potassium, is described. Such a plasma is used as an excitation source for the direct determination of Cs, Rb and Li. A high potassium chloride content in the solutions (of the order of 1%), significantly lowers the excitation temperature, which causes a suppression of the high energy processes (and of the corresponding spectral lines). The signal to background ratio of the moderate to low excitation potential lines increased by 10-100. Calibration was carried out under optimal conditions, and detection limits in the range 23.5 μg/dm 3 to 0.055 μg/dm 3 were reached, with linearity across 4-6 orders of magnitude. The method was successfully applied for the direct determination of Li, Rb and Cs in mineral water samples that, for comparison, were also analyzed by flame emission spectrometry. Good agreement between the two methods was achieved. The accuracy of the method was verified by the international reference standard SRM 1643d.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Optimization of the conditions for the analytical application of a vertical argon stabilized DC are plasma, seeded by an easily ionizable element, potassium, is described. Such a plasma is used as an excitation source for the direct determination of Cs, Rb and Li. A high potassium chloride content in the solutions (of the order of 1%), significantly lowers the excitation temperature, which causes a suppression of the high energy processes (and of the corresponding spectral lines). The signal to background ratio of the moderate to low excitation potential lines increased by 10-100. Calibration was carried out under optimal conditions, and detection limits in the range 23.5 μg/dm 3 to 0.055 μg/dm 3 were reached, with linearity across 4-6 orders of magnitude. The method was successfully applied for the direct determination of Li, Rb and Cs in mineral water samples that, for comparison, were also analyzed by flame emission spectrometry. Good agreement between the two methods was achieved. The accuracy of the method was verified by the international reference standard SRM 1643d.
1594.
Knežević, Z; Mojović, L; Adnadjević, B
Immobilization of lipase on a hydrophobic zeolite type Y Journal Article
In: Journal of the Serbian Chemical Society, vol. 63, no. 4, pp. 257-264, 1998.
@article{Knežević1998257,
title = {Immobilization of lipase on a hydrophobic zeolite type Y},
author = {Z Knežević and L Mojović and B Adnadjević},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0041125863&partnerID=40&md5=a6bac72df832146efb1de626ade8a54b},
year = {1998},
date = {1998-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {63},
number = {4},
pages = {257-264},
abstract = {Lipase from Candida cylindracea was immobilized by adsorption on a hydrophobic zeolite type Y. The maximal amount of bound protein of 8.2 mg g and an immobilization efficiency of 33% were achieved under optimum conditions. The kinetics of lipase binding to the zeolite were assessed using a general model of topochemical reactions. Based on the values of the parameters of the specific kinetic model, we propose that the adsorption process is controlled by surface kinetics. This was later experimentally confirmed. The activation energy for lipase adsorption on the zeolite is 43 kJ mol-1.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Lipase from Candida cylindracea was immobilized by adsorption on a hydrophobic zeolite type Y. The maximal amount of bound protein of 8.2 mg g and an immobilization efficiency of 33% were achieved under optimum conditions. The kinetics of lipase binding to the zeolite were assessed using a general model of topochemical reactions. Based on the values of the parameters of the specific kinetic model, we propose that the adsorption process is controlled by surface kinetics. This was later experimentally confirmed. The activation energy for lipase adsorption on the zeolite is 43 kJ mol-1.
1595.
Radotić, K; Radenović, Č; Jeremić, M
Spontaneous Ultraweak Bioluminescence in Plants: Origin, Mechanisms and Properties Journal Article
In: General Physiology and Biophysics, vol. 17, no. 4, pp. 289-308, 1998.
@article{Radotić1998289,
title = {Spontaneous Ultraweak Bioluminescence in Plants: Origin, Mechanisms and Properties},
author = {K Radotić and Č Radenović and M Jeremić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032249365&partnerID=40&md5=bb88ad4ec687f785dadd7b0e3c38b3d2},
year = {1998},
date = {1998-01-01},
journal = {General Physiology and Biophysics},
volume = {17},
number = {4},
pages = {289-308},
abstract = {An analysis of theoretical knowledge and experimental results of ultraweak luminescence (UWL) is provided. The role of excited state of molecules and free radicals, formed in various biochemical reactions, in UWL is discussed. UWL of model reactions and in vivo systems are compared. The hypothesis of coherent electromagnetic field as a source of UWL is also discussed. Spectral, kinetic and temporal properties of UWL are summarised, as well as their connection with its origin and role in the organism. Attention is paid to recent progress in experimental methods of low-light detection. The possible use of UWL in environmental studies, selection and other applications is discussed.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
An analysis of theoretical knowledge and experimental results of ultraweak luminescence (UWL) is provided. The role of excited state of molecules and free radicals, formed in various biochemical reactions, in UWL is discussed. UWL of model reactions and in vivo systems are compared. The hypothesis of coherent electromagnetic field as a source of UWL is also discussed. Spectral, kinetic and temporal properties of UWL are summarised, as well as their connection with its origin and role in the organism. Attention is paid to recent progress in experimental methods of low-light detection. The possible use of UWL in environmental studies, selection and other applications is discussed.
1596.
Petković, J; Minić, D; Korićanac, Z; Jovanović, T
Potentiometric determination of famotidine in pharmaceutical dosage forms Journal Article
In: Pharmazie, vol. 53, no. 3, pp. 163-164, 1998.
@article{Petković1998163,
title = {Potentiometric determination of famotidine in pharmaceutical dosage forms},
author = {J Petković and D Minić and Z Korićanac and T Jovanović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031822702&partnerID=40&md5=67090c754e8a3a220e781d0f928081fd},
year = {1998},
date = {1998-01-01},
journal = {Pharmazie},
volume = {53},
number = {3},
pages = {163-164},
abstract = {A simple and rapid method for the determination of famotidine is described. Famotidine is titrated with a solution of palladium(II)-chloride in Britton-Robinson buffer (pH = 3.60) using a silver indicator electrode. A stable yellow complex is formed. A significant step of the potential appears when the stoichiometric ratio of palladium(II) to famotidine is 1:1. The method is suitable for the determination of micro quantities (2.5-0.8 mg) of famotidine alone or in pharmaceutical dosage farms with a relative standard deviation of 0.7-2.3%.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A simple and rapid method for the determination of famotidine is described. Famotidine is titrated with a solution of palladium(II)-chloride in Britton-Robinson buffer (pH = 3.60) using a silver indicator electrode. A stable yellow complex is formed. A significant step of the potential appears when the stoichiometric ratio of palladium(II) to famotidine is 1:1. The method is suitable for the determination of micro quantities (2.5-0.8 mg) of famotidine alone or in pharmaceutical dosage farms with a relative standard deviation of 0.7-2.3%.
1597.
Malović, D; Vučelić, D
Application of thermal analysis for explaining the sorption of benzene and n-hexane on silicalite Journal Article
In: Journal of Thermal Analysis and Calorimetry, vol. 53, no. 3, pp. 835-842, 1998.
@article{Malović1998835,
title = {Application of thermal analysis for explaining the sorption of benzene and n-hexane on silicalite},
author = {D Malović and D Vučelić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032292594&doi=10.1023%2fA%3a1010194817066&partnerID=40&md5=38314f454e07db1b3ea3d5a57132ebee},
doi = {10.1023/A:1010194817066},
year = {1998},
date = {1998-01-01},
journal = {Journal of Thermal Analysis and Calorimetry},
volume = {53},
number = {3},
pages = {835-842},
abstract = {The origin of kinks (steps) on sorption isotherms was examined for the sorption of benzene and n-hexane on silicalite-1. In both cases sorption revealed the existence of two different binding sites. There was no equilibrium (or a very slow one), between molecules bound at different sites. Sorption energies within particular centres display more or less wide overlapping distributions leading to a single resultant isotherm. Depending on differences in binding energies and degree of overlapping, the resulting isotherms exhibit steps (benzene) or no steps (n-hexane). In fact, the sorption isotherm of benzene being a sum of two elemental isotherms (Ω1 and Ω2) of different shapes is characterized by a 'kink', in contrast to n-hexane the elemental isotherms of which are of the same shape.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The origin of kinks (steps) on sorption isotherms was examined for the sorption of benzene and n-hexane on silicalite-1. In both cases sorption revealed the existence of two different binding sites. There was no equilibrium (or a very slow one), between molecules bound at different sites. Sorption energies within particular centres display more or less wide overlapping distributions leading to a single resultant isotherm. Depending on differences in binding energies and degree of overlapping, the resulting isotherms exhibit steps (benzene) or no steps (n-hexane). In fact, the sorption isotherm of benzene being a sum of two elemental isotherms (Ω1 and Ω2) of different shapes is characterized by a 'kink', in contrast to n-hexane the elemental isotherms of which are of the same shape.
1598.
Schmidt, C; Perić, M; Mürtz, P; Wienkoop, M; Havenith, M; Urban, W
Faraday Laser Magnetic Resonance Spectroscopy of Vibrationally Excited C2D Journal Article
In: Journal of Molecular Spectroscopy, vol. 190, no. 1, pp. 112-124, 1998.
@article{Schmidt1998112,
title = {Faraday Laser Magnetic Resonance Spectroscopy of Vibrationally Excited C2D},
author = {C Schmidt and M Perić and P Mürtz and M Wienkoop and M Havenith and W Urban},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0011741228&doi=10.1006%2fjmsp.1998.7563&partnerID=40&md5=c296fdb9698f6f009ab9012f814bffdc},
doi = {10.1006/jmsp.1998.7563},
year = {1998},
date = {1998-01-01},
journal = {Journal of Molecular Spectroscopy},
volume = {190},
number = {1},
pages = {112-124},
abstract = {We studied the gas phase spectrum of the deuterated ethynyl radical C2D in the region between 3196 and 3243 cm-1 using a Faraday LMR spectrometer in combination with a CO overtone laser. The C2D radicals were generated in a dc glow discharge containing helium, deuterium, and acetylene. We observed a hot band between two vibronic 2Π states with an origin at 3225 cm-1. The lower level is assigned to the first excited bending level of the electronic X ground state. The upper level corresponds to the first excited electronic state A at 3513 cm-1, which was observed previously [J. Mol. Struct. 190, 41-60 (1988)]. This region is subject to strong vibronic interaction, caused by mixing of the electronic X ground state with the A state at 3513 cm-1. From the analysis of the spectra we could determine the orbital g factor of the upper level, which gave important information about the mixing ratios. In addition we were able to derive a precise term value for the first excited bending level of the electronic X ground state. The experimentally derived molecular parameters are compared with theoretically calculated values, obtained by ab initio calculations. © 1998 Academic Press.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We studied the gas phase spectrum of the deuterated ethynyl radical C2D in the region between 3196 and 3243 cm-1 using a Faraday LMR spectrometer in combination with a CO overtone laser. The C2D radicals were generated in a dc glow discharge containing helium, deuterium, and acetylene. We observed a hot band between two vibronic 2Π states with an origin at 3225 cm-1. The lower level is assigned to the first excited bending level of the electronic X ground state. The upper level corresponds to the first excited electronic state A at 3513 cm-1, which was observed previously [J. Mol. Struct. 190, 41-60 (1988)]. This region is subject to strong vibronic interaction, caused by mixing of the electronic X ground state with the A state at 3513 cm-1. From the analysis of the spectra we could determine the orbital g factor of the upper level, which gave important information about the mixing ratios. In addition we were able to derive a precise term value for the first excited bending level of the electronic X ground state. The experimentally derived molecular parameters are compared with theoretically calculated values, obtained by ab initio calculations. © 1998 Academic Press.
1599.
Mićić, M; Jovančićević, B; Polić, P; Šušić, N; Marković, D
In: Fresenius Environmental Bulletin, vol. 7, no. 11-12, pp. 648-653, 1998.
@article{Mićić1998648,
title = {Classification tools based on artificial neural networks for the purpose of identification of origin of organic matter and oil pollution in recent sediments},
author = {M Mićić and B Jovančićević and P Polić and N Šušić and D Marković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031729552&partnerID=40&md5=72b6fe68fe17bb2d918862c2c51b5902},
year = {1998},
date = {1998-01-01},
journal = {Fresenius Environmental Bulletin},
volume = {7},
number = {11-12},
pages = {648-653},
abstract = {The distinction between autochthonous, and oil-like origin of organic matter in geological sediments can be performed on the basis of n-alkane abundance and distribution patterns, determined by gas chromatography, or on the basis of the carbon-isotope ratio (δC13PDB) patterns of dominant n-alkanes, determined by gas chromatography-mass spectroscopy. Here we present solutions for automatic classification of organic matter origin in geological sediments, based on artificial neural networks.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The distinction between autochthonous, and oil-like origin of organic matter in geological sediments can be performed on the basis of n-alkane abundance and distribution patterns, determined by gas chromatography, or on the basis of the carbon-isotope ratio (δC13PDB) patterns of dominant n-alkanes, determined by gas chromatography-mass spectroscopy. Here we present solutions for automatic classification of organic matter origin in geological sediments, based on artificial neural networks.
1600.
Radotić, K; Todorović, S; Zakrzewska, J; Jeremić, M
In: Photochemistry and Photobiology, vol. 68, no. 5, pp. 703-709, 1998.
@article{Radotić1998703,
title = {Study of Photochemical Reactions of Coniferyl Alcohol. II. Comparative Structural Study of a Photochemical and Enzymatic Polymer of Coniferyl Alcohol},
author = {K Radotić and S Todorović and J Zakrzewska and M Jeremić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0000657138&doi=10.1111%2fj.1751-1097.1998.tb02533.x&partnerID=40&md5=0e92383443850678427aad92d5381440},
doi = {10.1111/j.1751-1097.1998.tb02533.x},
year = {1998},
date = {1998-01-01},
journal = {Photochemistry and Photobiology},
volume = {68},
number = {5},
pages = {703-709},
abstract = {The structure of the polymer synthesized by UV irradiation of coniferyl alcohol was studied, using UV-visible, Raman, IR, 1H-NMR and 13C-NMR spectroscopy. The photochemical polymer was compared with the structure of the polymer obtained by peroxidase-catalyzed polymerization of coniferyl alcohol. General similarity of the spectra of the two polymers was shown. However, differences in the fine structure of particular regions of the NMR spectra, as well as in certain bands in the Raman and IR spectra, could be explained through the various bond types and organization within the polymers. These results are consistent with molecular mass distribution of the polymers. Two fractions of enzymatic polymer correspond to the main two fractions of photochemical polymer. The later polymer has additional fractions that are probably the main reason for the observed spectral differences.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The structure of the polymer synthesized by UV irradiation of coniferyl alcohol was studied, using UV-visible, Raman, IR, 1H-NMR and 13C-NMR spectroscopy. The photochemical polymer was compared with the structure of the polymer obtained by peroxidase-catalyzed polymerization of coniferyl alcohol. General similarity of the spectra of the two polymers was shown. However, differences in the fine structure of particular regions of the NMR spectra, as well as in certain bands in the Raman and IR spectra, could be explained through the various bond types and organization within the polymers. These results are consistent with molecular mass distribution of the polymers. Two fractions of enzymatic polymer correspond to the main two fractions of photochemical polymer. The later polymer has additional fractions that are probably the main reason for the observed spectral differences.
1998
Vidić, J; Sužnjević, D; Erceg, M; Vučelić, D
Adsorption behaviour of insulin and soybean trypsin inhibitor at the mercury | solution interface Journal Article
In: Journal of Electroanalytical Chemistry, vol. 452, no. 2, pp. 151-159, 1998.
@article{Vidić1998151,
title = {Adsorption behaviour of insulin and soybean trypsin inhibitor at the mercury | solution interface},
author = {J Vidić and D Sužnjević and M Erceg and D Vučelić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032119168&doi=10.1016%2fS0022-0728%2898%2900110-7&partnerID=40&md5=86508cf74174ff4c5243ef0ab5829d22},
doi = {10.1016/S0022-0728(98)00110-7},
year = {1998},
date = {1998-01-01},
journal = {Journal of Electroanalytical Chemistry},
volume = {452},
number = {2},
pages = {151-159},
abstract = {The adsorption of insulin and soybean trypsin inhibitor (STI) on the mercury electrode was investigated with phase-sensitive alternating current (ac) polarography. The investigations focused on the effect of insulin and STI concentrations on the capacitive ac component over a wide potential range at pH 8.8, when both proteins are in folded form, and at pH 1.0 when they are unfolded. Besides a pseudo-capacitance due to the faradaic process of protein -S-S- bond reduction, the presence of protein adsorption of the Frumkin type was established. From the analysis of the corresponding adsorption isotherms, the relevant thermodynamic adsorption parameters were determined. Similarities in the adsorption characteristics of both proteins studied were demonstrated, and the differences in the adsorption behaviour between native and denatured proteins were proven. The data obtained is also discussed from the aspect of protein disulphide bond interaction with mercury. © 1998 Elsevier Science S.A. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The adsorption of insulin and soybean trypsin inhibitor (STI) on the mercury electrode was investigated with phase-sensitive alternating current (ac) polarography. The investigations focused on the effect of insulin and STI concentrations on the capacitive ac component over a wide potential range at pH 8.8, when both proteins are in folded form, and at pH 1.0 when they are unfolded. Besides a pseudo-capacitance due to the faradaic process of protein -S-S- bond reduction, the presence of protein adsorption of the Frumkin type was established. From the analysis of the corresponding adsorption isotherms, the relevant thermodynamic adsorption parameters were determined. Similarities in the adsorption characteristics of both proteins studied were demonstrated, and the differences in the adsorption behaviour between native and denatured proteins were proven. The data obtained is also discussed from the aspect of protein disulphide bond interaction with mercury. © 1998 Elsevier Science S.A. All rights reserved.
Šašić, S; Kuzmanović, M
Raman Spectroscopic Study of Acetone-Phenol Mixtures Journal Article
In: Journal of Raman Spectroscopy, vol. 29, no. 7, pp. 592-599, 1998.
@article{Šašić1998592,
title = {Raman Spectroscopic Study of Acetone-Phenol Mixtures},
author = {S Šašić and M Kuzmanović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0542451810&partnerID=40&md5=d690d7d5da7d33d863035bd9a82c6d98},
year = {1998},
date = {1998-01-01},
journal = {Journal of Raman Spectroscopy},
volume = {29},
number = {7},
pages = {592-599},
abstract = {Acetone-phenol mixtures with phenol mole fractions in the range 0.079-0.6000 were studied by Raman spectroscopy. Spectra were obtained in the regions of acetone C=O stretching and C-C symmetric stretching bands. Principal factor analysis applied to the set of C=O stretching bands revealed two independent components belonging to free and hydrogen-bonded acetone. Interaction with phenol produces a new band at a lower wavenumber in the C=O vibration region and an additional band at a higher wavenumber in the C-C symmetric stretch region. These changes were explained by charge delocalization induced by the hydrogen bond. On applying band deconvolution and target factor analysis, it was deduced that the equilibrium constant K of 1:1 acetone-phenol complex formation is too high to be determined by Raman spectroscopy in the range 0.079-0.400 mole fraction of phenol. At equal mole fractions of acetone and phenol, values of K = 2.61 and 3.22 dm 3 mol -1 were obtained by deconvolution and target factor analysis, respectively. An investigation of ternary solutions with an inert solvent showed no significant differences in acetone-phenol interaction between this system and binary mixtures. © 1998 John Wiley & Sons, Ltd.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Acetone-phenol mixtures with phenol mole fractions in the range 0.079-0.6000 were studied by Raman spectroscopy. Spectra were obtained in the regions of acetone C=O stretching and C-C symmetric stretching bands. Principal factor analysis applied to the set of C=O stretching bands revealed two independent components belonging to free and hydrogen-bonded acetone. Interaction with phenol produces a new band at a lower wavenumber in the C=O vibration region and an additional band at a higher wavenumber in the C-C symmetric stretch region. These changes were explained by charge delocalization induced by the hydrogen bond. On applying band deconvolution and target factor analysis, it was deduced that the equilibrium constant K of 1:1 acetone-phenol complex formation is too high to be determined by Raman spectroscopy in the range 0.079-0.400 mole fraction of phenol. At equal mole fractions of acetone and phenol, values of K = 2.61 and 3.22 dm 3 mol -1 were obtained by deconvolution and target factor analysis, respectively. An investigation of ternary solutions with an inert solvent showed no significant differences in acetone-phenol interaction between this system and binary mixtures. © 1998 John Wiley & Sons, Ltd.
Šašić, S; Jeremić, M; Antić-Jovanović, A
Raman Study of Solvent-Solute Interactions in Solutions of Mercury(II)-Thiocyanate Complexes Journal Article
In: Journal of Raman Spectroscopy, vol. 29, no. 4, pp. 321-325, 1998.
@article{Šašić1998321,
title = {Raman Study of Solvent-Solute Interactions in Solutions of Mercury(II)-Thiocyanate Complexes},
author = {S Šašić and M Jeremić and A Antić-Jovanović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0542404156&doi=10.1002%2f%28SICI%291097-4555%28199804%2929%3a4%3c321%3a%3aAID-JRS244%3e3.0.CO%3b2-Q&partnerID=40&md5=b3c05d6c9c4348f96b7d075c21174469},
doi = {10.1002/(SICI)1097-4555(199804)29:4<321::AID-JRS244>3.0.CO;2-Q},
year = {1998},
date = {1998-01-01},
journal = {Journal of Raman Spectroscopy},
volume = {29},
number = {4},
pages = {321-325},
abstract = {Raman spectra of the Hg(SCN)2, [Hg(SCN)3]- and [Hg(SCN)4]2- complex species in solution were investigated for 10 donor solvents in the v(CN) and v(CS) wavenumber regions. Attempts were made to relate the solvent donor strength to overall vibrational properties of the complexes. A good correlation of v(CN) with v(HgS) and consequently with solvent donor properties was found in solutions Of Hg(SCN)2 and [Hg (SCN)3]-. Wavenumber differences Δṽ(CN), calculated as the difference between wavenumbers of coordinated and free SCN- ligands, correlate well with the solvent donor strength scale, Ds. The Δv(CN) values for Hg(SCN)2 and [Hg(SCN)3]- can be used as an indicator of solvent donor capacity. Data derived from the Δv(CN) shifts show a better correlation with solvent donor ability than those obtained from the v(CS) wavenumber. The spectral properties of [Hg(SCN)4]2- complex depend only on the electrophilic properties of the solvent and not on its donor strength, because solvent molecules cannot penetrate into the first coordination sphere and donate an electron pair to Hg(II). Solvent electrophilic interaction with coordinated thiocyanate is proportional to its acceptor number.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Raman spectra of the Hg(SCN)2, [Hg(SCN)3]- and [Hg(SCN)4]2- complex species in solution were investigated for 10 donor solvents in the v(CN) and v(CS) wavenumber regions. Attempts were made to relate the solvent donor strength to overall vibrational properties of the complexes. A good correlation of v(CN) with v(HgS) and consequently with solvent donor properties was found in solutions Of Hg(SCN)2 and [Hg (SCN)3]-. Wavenumber differences Δṽ(CN), calculated as the difference between wavenumbers of coordinated and free SCN- ligands, correlate well with the solvent donor strength scale, Ds. The Δv(CN) values for Hg(SCN)2 and [Hg(SCN)3]- can be used as an indicator of solvent donor capacity. Data derived from the Δv(CN) shifts show a better correlation with solvent donor ability than those obtained from the v(CS) wavenumber. The spectral properties of [Hg(SCN)4]2- complex depend only on the electrophilic properties of the solvent and not on its donor strength, because solvent molecules cannot penetrate into the first coordination sphere and donate an electron pair to Hg(II). Solvent electrophilic interaction with coordinated thiocyanate is proportional to its acceptor number.
Perić, M; Radić-Perić, J
Ab initio investigation of the vibronic structure and the spin-orbit coupling in the X2Πu state of C2D2 + Journal Article
In: Chemical Physics Letters, vol. 290, no. 4-6, pp. 443-450, 1998.
@article{Perić1998443,
title = {Ab initio investigation of the vibronic structure and the spin-orbit coupling in the X2Πu state of C2D2 +},
author = {M Perić and J Radić-Perić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0039500669&doi=10.1016%2fS0009-2614%2898%2900521-1&partnerID=40&md5=6b5679ce99d8e7687a00fb1ce9d9aba8},
doi = {10.1016/S0009-2614(98)00521-1},
year = {1998},
date = {1998-01-01},
journal = {Chemical Physics Letters},
volume = {290},
number = {4-6},
pages = {443-450},
abstract = {Results of an ab initio study of the Renner-Teller effect in the X2Πu state of C2D2 + are presented. Potential curves for the trans- and cis-bending vibrations calculated by means of the internally contracted multireference configuration interaction method are employed. Vibronic energy levels and their splitting upon spin-orbit coupling are computed by means of a variational approach. © 1998 Elsevier Science B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Results of an ab initio study of the Renner-Teller effect in the X2Πu state of C2D2 + are presented. Potential curves for the trans- and cis-bending vibrations calculated by means of the internally contracted multireference configuration interaction method are employed. Vibronic energy levels and their splitting upon spin-orbit coupling are computed by means of a variational approach. © 1998 Elsevier Science B.V. All rights reserved.
Ignjatović, L M; Veselinović, D S; Marković, D A; Vukelić, N S
Adsorptive stripping voltammetric determination of the herbicides atrazine and ametryne Journal Article
In: Journal of the Serbian Chemical Society, vol. 63, no. 1, pp. 75-84, 1998.
@article{Ignjatović199875,
title = {Adsorptive stripping voltammetric determination of the herbicides atrazine and ametryne},
author = {L M Ignjatović and D S Veselinović and D A Marković and N S Vukelić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032354618&partnerID=40&md5=f95ff508872640e4c011577696e16a41},
year = {1998},
date = {1998-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {63},
number = {1},
pages = {75-84},
abstract = {The optimum conditions were established for the determination of the herbicides atrazine and ametryne by differential-pulse voltammetry at a hanging mercury drop electrode in the concentration range from 1×10 -5 to 1×10 -7 mol dm -3 using a supporting electrolyte at pH 3.0. The sensitivity of the determination can be improved through adsorptive accumulation of the investigated substances on the surface of the hanging mercury drop electrode: differential-pulse adsoprtive stripping voltammetry enables the determination of atrazine (at pH 3.0) and ametryne (at pH 3.0 and 5.0) in the concentration range from 1×10 -7 to 1×10 -9 mol dm -3 . The method described is selective: the herbicides under study can be determined in their mixture according to the dependence of the peak current on pH. The procedure was applied to the selective determination of atrazine and ametryne in various standard solutions, with results of satisfactory accuracy and precision. Recoveries were 97.5-105%.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The optimum conditions were established for the determination of the herbicides atrazine and ametryne by differential-pulse voltammetry at a hanging mercury drop electrode in the concentration range from 1×10 -5 to 1×10 -7 mol dm -3 using a supporting electrolyte at pH 3.0. The sensitivity of the determination can be improved through adsorptive accumulation of the investigated substances on the surface of the hanging mercury drop electrode: differential-pulse adsoprtive stripping voltammetry enables the determination of atrazine (at pH 3.0) and ametryne (at pH 3.0 and 5.0) in the concentration range from 1×10 -7 to 1×10 -9 mol dm -3 . The method described is selective: the herbicides under study can be determined in their mixture according to the dependence of the peak current on pH. The procedure was applied to the selective determination of atrazine and ametryne in various standard solutions, with results of satisfactory accuracy and precision. Recoveries were 97.5-105%.
Šašić, S
Quantitative analysis of overlapped Raman spectra by target factor analysis and evolving factor analysis Journal Article
In: Analyst, vol. 123, no. 6, pp. 1193-1197, 1998.
@article{Šašić19981193,
title = {Quantitative analysis of overlapped Raman spectra by target factor analysis and evolving factor analysis},
author = {S Šašić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031812548&doi=10.1039%2fa800019k&partnerID=40&md5=2ea328ec297f01be700aa67e23d2060a},
doi = {10.1039/a800019k},
year = {1998},
date = {1998-01-01},
journal = {Analyst},
volume = {123},
number = {6},
pages = {1193-1197},
abstract = {A system of overlapped Raman spectra was formed on the basis of three experimentally recorded basic bands and quantitatively analysed by two statistical methods: target factor analysis (TFA) and evolving factor analysis (EFA). The results were compared with one another and with the true values. For intense bands, the values obtained by both methods were in good agreement with the expected values, while for small shoulders of strong bands quantitative analysis by EFA apparently gave better results than TFA.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A system of overlapped Raman spectra was formed on the basis of three experimentally recorded basic bands and quantitatively analysed by two statistical methods: target factor analysis (TFA) and evolving factor analysis (EFA). The results were compared with one another and with the true values. For intense bands, the values obtained by both methods were in good agreement with the expected values, while for small shoulders of strong bands quantitative analysis by EFA apparently gave better results than TFA.
Ciric-Marjanovic, G; Mentus, S
Charge-discharge characteristics of polythiophene as a cathode active material in a rechargeable battery Journal Article
In: Journal of Applied Electrochemistry, vol. 28, no. 1, pp. 103-106, 1998.
@article{Ciric-Marjanovic1998103,
title = {Charge-discharge characteristics of polythiophene as a cathode active material in a rechargeable battery},
author = {G Ciric-Marjanovic and S Mentus},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031701528&doi=10.1023%2fA%3a1003210220871&partnerID=40&md5=1af60bae8f0f2def70fb3549b7c736c9},
doi = {10.1023/A:1003210220871},
year = {1998},
date = {1998-01-01},
journal = {Journal of Applied Electrochemistry},
volume = {28},
number = {1},
pages = {103-106},
abstract = {Polythiophene films were electrochemically deposited on glassy carbon substrates under potentiostatic control and used as cathode active material together with a Zn anode in a rechargeable battery with propylene carbonate, Zn(ClO4)2, LiClO4 electrolyte. Charge-discharge characteristics were studied. The average discharge voltage of the polythiophene/Zn cell was 1.25 V. In the low current density region (i.e. 10-50 μA cm-2) the cycling coulombic efficiency was above 95%, but in the fast charge-discharge region, where current densities were 0.1-0.5 mA cm-2, the coulombic efficiency decreased to 55% with increasing discharge rate. Additionally, it was found that the cyclic coulombic efficiency was a function of the charging depth.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Polythiophene films were electrochemically deposited on glassy carbon substrates under potentiostatic control and used as cathode active material together with a Zn anode in a rechargeable battery with propylene carbonate, Zn(ClO4)2, LiClO4 electrolyte. Charge-discharge characteristics were studied. The average discharge voltage of the polythiophene/Zn cell was 1.25 V. In the low current density region (i.e. 10-50 μA cm-2) the cycling coulombic efficiency was above 95%, but in the fast charge-discharge region, where current densities were 0.1-0.5 mA cm-2, the coulombic efficiency decreased to 55% with increasing discharge rate. Additionally, it was found that the cyclic coulombic efficiency was a function of the charging depth.
Lalić, M; Šašic, S; Antić-Jovanović, A; Jeremić, M
An investigation of the digitized Raman band profiles of aqueous Mg(ClO4)2 - NaSCN solutions Journal Article
In: Spectroscopy Letters, vol. 31, no. 2, pp. 335-346, 1998.
@article{Lalić1998335,
title = {An investigation of the digitized Raman band profiles of aqueous Mg(ClO4)2 - NaSCN solutions},
author = {M Lalić and S Šašic and A Antić-Jovanović and M Jeremić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0009711955&doi=10.1080%2f00387019808003258&partnerID=40&md5=5c4f7d46b05f603658a1ed319fe99569},
doi = {10.1080/00387019808003258},
year = {1998},
date = {1998-01-01},
journal = {Spectroscopy Letters},
volume = {31},
number = {2},
pages = {335-346},
abstract = {Raman spectra, together with factor analysis and band deconvolution procedure, have been used to study formation of magnesium thiocyanate complexes in aqueous solutions at ambient and elevated temperatures. The total salt concentration in solutions, containing different mole ratio of Mg2+ to SCN-, varied between 3.4 and 7.5 mol dm-3. Factor analyses indicated that two linearly independent scattering components in the band envelopes, recorded in the v1 and v3 stretching regions of SCN-, for all solutions with total salt concentration of 3.4 mol dm-3. The appearance of a pseudo-isosbestic point in the area normalized spectra supported this result, as well as the band resolution procedure. The latter revealed the third scattering component in the spectra of solutions with total salt concentration above 3.5 mol dm-3. Resolved components have been assigned to the free thiocyanate, the 1:1 and 1:2 magnesium thiocyanate complexes. The equilibrium constant KC of the 1:1 complex is of an order of 10-1mol dm-3.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Raman spectra, together with factor analysis and band deconvolution procedure, have been used to study formation of magnesium thiocyanate complexes in aqueous solutions at ambient and elevated temperatures. The total salt concentration in solutions, containing different mole ratio of Mg2+ to SCN-, varied between 3.4 and 7.5 mol dm-3. Factor analyses indicated that two linearly independent scattering components in the band envelopes, recorded in the v1 and v3 stretching regions of SCN-, for all solutions with total salt concentration of 3.4 mol dm-3. The appearance of a pseudo-isosbestic point in the area normalized spectra supported this result, as well as the band resolution procedure. The latter revealed the third scattering component in the spectra of solutions with total salt concentration above 3.5 mol dm-3. Resolved components have been assigned to the free thiocyanate, the 1:1 and 1:2 magnesium thiocyanate complexes. The equilibrium constant KC of the 1:1 complex is of an order of 10-1mol dm-3.
Sovilj, S P; Babić-Samardžija, K; Minić, D M
Synthesis and physicochemical characterization of the complex cis-[Co(acac)cyclam](ClO 4 ) 2 Journal Article
In: Journal of the Serbian Chemical Society, vol. 63, no. 12, pp. 979-985, 1998.
@article{Sovilj1998979,
title = {Synthesis and physicochemical characterization of the complex cis-[Co(acac)cyclam](ClO 4 ) 2},
author = {S P Sovilj and K Babić-Samardžija and D M Minić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0038854978&partnerID=40&md5=bb33b1af07cd896fcc3fa72d8fd49898},
year = {1998},
date = {1998-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {63},
number = {12},
pages = {979-985},
abstract = {A new cobalt(III) complex cis-[Co(acac)cyclam](ClO 4 ) 2 (cyclam = 1,4,8,11-tetraazacyclotetradecane},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A new cobalt(III) complex cis-[Co(acac)cyclam](ClO 4 ) 2 (cyclam = 1,4,8,11-tetraazacyclotetradecane
Kuntic, V; Kosanić, M; Malešev, D; Radović, Z; Mioč, U
Spectrophotometric investigation of the uranil(II)-hesperidin complex in 70% methanol Journal Article
In: Journal of the Serbian Chemical Society, vol. 63, no. 7, pp. 565-572, 1998.
@article{Kuntic1998565,
title = {Spectrophotometric investigation of the uranil(II)-hesperidin complex in 70% methanol},
author = {V Kuntic and M Kosanić and D Malešev and Z Radović and U Mioč},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0040115540&partnerID=40&md5=6afb7d53e5a4334aeffbd3006ac4ca2d},
year = {1998},
date = {1998-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {63},
number = {7},
pages = {565-572},
abstract = {The composition and stability constant of the UO2(II)-hesperidin complex were determined by suitable spectrophotometric methods and pH-metric measurements. It was found that the uranil ion and hesperidin form a 1:2 complex in which the uranil ion is linked to the hesperidin molecule through the carbonyl and the 5-hydroxyl group. The relative stability constant, log K 2 , ranged from 5.77 at pH 4.0 to 7.00 at pH 6.0. The conditions for the spectrophotometric determination of hesperidin, Dy means of reaction of the complex formation reaction, were investigated. Beer's law was obeyed up to 2.0x10 -5 mol dm -3 hesperidin.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The composition and stability constant of the UO2(II)-hesperidin complex were determined by suitable spectrophotometric methods and pH-metric measurements. It was found that the uranil ion and hesperidin form a 1:2 complex in which the uranil ion is linked to the hesperidin molecule through the carbonyl and the 5-hydroxyl group. The relative stability constant, log K 2 , ranged from 5.77 at pH 4.0 to 7.00 at pH 6.0. The conditions for the spectrophotometric determination of hesperidin, Dy means of reaction of the complex formation reaction, were investigated. Beer's law was obeyed up to 2.0x10 -5 mol dm -3 hesperidin.
Malinar, M J; Miodragović, Dj. U.; Milosavljević, S; Ćelap, M B; Vučelić, D
Mixed cobalt(III) complexes with S-tyrosine and 1,3-diaminopropane Journal Article
In: Enantiomer, vol. 3, no. 4-5, pp. 349-356, 1998.
@article{Malinar1998349,
title = {Mixed cobalt(III) complexes with S-tyrosine and 1,3-diaminopropane},
author = {M J Malinar and Dj.U. Miodragović and S Milosavljević and M B Ćelap and D Vučelić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032409344&partnerID=40&md5=70980818ca6de7fe19d6bd63012c6b91},
year = {1998},
date = {1998-01-01},
journal = {Enantiomer},
volume = {3},
number = {4-5},
pages = {349-356},
abstract = {Four out of six theoretically possible isomers of the (1,3-diaminopropane)bis(S-tyrosinato)cobalt(III) complex, having the cis(O) configuration, were isolated, and the trans(O) isomer was only defined in the eluate. The isomers were separated on an optically active Sephadex QAE column. Geometrical and absolute configurations of the isomers were determined by electronic absorption, circular dichroic and 1 H NMR spectra. The effect of the aromatic side group of the coordinated S-tyrosinato ligand on the stereoselective formation of the obtained isomers was examined.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Four out of six theoretically possible isomers of the (1,3-diaminopropane)bis(S-tyrosinato)cobalt(III) complex, having the cis(O) configuration, were isolated, and the trans(O) isomer was only defined in the eluate. The isomers were separated on an optically active Sephadex QAE column. Geometrical and absolute configurations of the isomers were determined by electronic absorption, circular dichroic and 1 H NMR spectra. The effect of the aromatic side group of the coordinated S-tyrosinato ligand on the stereoselective formation of the obtained isomers was examined.
Kuntić, V S; Malešev, D L; Radović, Z V; Kosanić, M M; Mioč, U B; Vukojević, V B
Spectrophotometric Investigation of Uranil(II)-Rutin Complex in 70% Ethanol Journal Article
In: Journal of Agricultural and Food Chemistry, vol. 46, no. 12, pp. 5139-5142, 1998.
@article{Kuntić19985139,
title = {Spectrophotometric Investigation of Uranil(II)-Rutin Complex in 70% Ethanol},
author = {V S Kuntić and D L Malešev and Z V Radović and M M Kosanić and U B Mioč and V B Vukojević},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0001715255&doi=10.1021%2fjf980376k&partnerID=40&md5=197954ad78ea77f4e88ee2d706c7c43f},
doi = {10.1021/jf980376k},
year = {1998},
date = {1998-01-01},
journal = {Journal of Agricultural and Food Chemistry},
volume = {46},
number = {12},
pages = {5139-5142},
abstract = {The composition and stability constant of a UO2(II)-rutin complex in 70% ethanol were determined by suitable spectrophotometric methods and pH measurement. UC2(II) ion and rutin (3,3′,4′,5,7-pentahydroxyflavone-3-rhamnoglucoside) form a 1:1 complex in which the UO2(II) ion is linked to rutin through the carbonyl and 5-hydroxyl group. The concentration stability constant of the complex, log β1, ranged from 6.57 at pH 4.00 to 4.72 at pH 7.00. Conditions for spectrophotometric determination of rutin, by complex formation with UO2(II) ion, were investigated. Beer's law was obeyed in the concentration range from 1.0 x 10-5 to 2.0 x 10-4 M for rutin. Determination of rutin in Rutinion forte tablets was demonstrated.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The composition and stability constant of a UO2(II)-rutin complex in 70% ethanol were determined by suitable spectrophotometric methods and pH measurement. UC2(II) ion and rutin (3,3′,4′,5,7-pentahydroxyflavone-3-rhamnoglucoside) form a 1:1 complex in which the UO2(II) ion is linked to rutin through the carbonyl and 5-hydroxyl group. The concentration stability constant of the complex, log β1, ranged from 6.57 at pH 4.00 to 4.72 at pH 7.00. Conditions for spectrophotometric determination of rutin, by complex formation with UO2(II) ion, were investigated. Beer's law was obeyed in the concentration range from 1.0 x 10-5 to 2.0 x 10-4 M for rutin. Determination of rutin in Rutinion forte tablets was demonstrated.
Stoiljković, M M; Holclajtner-Antunović, I; Pavlović, M S; Radak, B B
Determination of cesium, rubidium and lithium by stabilized DC arc plasma emission spectrometry Journal Article
In: Journal of the Serbian Chemical Society, vol. 63, no. 9, pp. 733-741, 1998.
@article{Stoiljković1998733,
title = {Determination of cesium, rubidium and lithium by stabilized DC arc plasma emission spectrometry},
author = {M M Stoiljković and I Holclajtner-Antunović and M S Pavlović and B B Radak},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032372035&partnerID=40&md5=c1449cafc9bded379ce4ec915a07c74f},
year = {1998},
date = {1998-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {63},
number = {9},
pages = {733-741},
abstract = {Optimization of the conditions for the analytical application of a vertical argon stabilized DC are plasma, seeded by an easily ionizable element, potassium, is described. Such a plasma is used as an excitation source for the direct determination of Cs, Rb and Li. A high potassium chloride content in the solutions (of the order of 1%), significantly lowers the excitation temperature, which causes a suppression of the high energy processes (and of the corresponding spectral lines). The signal to background ratio of the moderate to low excitation potential lines increased by 10-100. Calibration was carried out under optimal conditions, and detection limits in the range 23.5 μg/dm 3 to 0.055 μg/dm 3 were reached, with linearity across 4-6 orders of magnitude. The method was successfully applied for the direct determination of Li, Rb and Cs in mineral water samples that, for comparison, were also analyzed by flame emission spectrometry. Good agreement between the two methods was achieved. The accuracy of the method was verified by the international reference standard SRM 1643d.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Optimization of the conditions for the analytical application of a vertical argon stabilized DC are plasma, seeded by an easily ionizable element, potassium, is described. Such a plasma is used as an excitation source for the direct determination of Cs, Rb and Li. A high potassium chloride content in the solutions (of the order of 1%), significantly lowers the excitation temperature, which causes a suppression of the high energy processes (and of the corresponding spectral lines). The signal to background ratio of the moderate to low excitation potential lines increased by 10-100. Calibration was carried out under optimal conditions, and detection limits in the range 23.5 μg/dm 3 to 0.055 μg/dm 3 were reached, with linearity across 4-6 orders of magnitude. The method was successfully applied for the direct determination of Li, Rb and Cs in mineral water samples that, for comparison, were also analyzed by flame emission spectrometry. Good agreement between the two methods was achieved. The accuracy of the method was verified by the international reference standard SRM 1643d.
Knežević, Z; Mojović, L; Adnadjević, B
Immobilization of lipase on a hydrophobic zeolite type Y Journal Article
In: Journal of the Serbian Chemical Society, vol. 63, no. 4, pp. 257-264, 1998.
@article{Knežević1998257,
title = {Immobilization of lipase on a hydrophobic zeolite type Y},
author = {Z Knežević and L Mojović and B Adnadjević},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0041125863&partnerID=40&md5=a6bac72df832146efb1de626ade8a54b},
year = {1998},
date = {1998-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {63},
number = {4},
pages = {257-264},
abstract = {Lipase from Candida cylindracea was immobilized by adsorption on a hydrophobic zeolite type Y. The maximal amount of bound protein of 8.2 mg g and an immobilization efficiency of 33% were achieved under optimum conditions. The kinetics of lipase binding to the zeolite were assessed using a general model of topochemical reactions. Based on the values of the parameters of the specific kinetic model, we propose that the adsorption process is controlled by surface kinetics. This was later experimentally confirmed. The activation energy for lipase adsorption on the zeolite is 43 kJ mol-1.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Lipase from Candida cylindracea was immobilized by adsorption on a hydrophobic zeolite type Y. The maximal amount of bound protein of 8.2 mg g and an immobilization efficiency of 33% were achieved under optimum conditions. The kinetics of lipase binding to the zeolite were assessed using a general model of topochemical reactions. Based on the values of the parameters of the specific kinetic model, we propose that the adsorption process is controlled by surface kinetics. This was later experimentally confirmed. The activation energy for lipase adsorption on the zeolite is 43 kJ mol-1.
Radotić, K; Radenović, Č; Jeremić, M
Spontaneous Ultraweak Bioluminescence in Plants: Origin, Mechanisms and Properties Journal Article
In: General Physiology and Biophysics, vol. 17, no. 4, pp. 289-308, 1998.
@article{Radotić1998289,
title = {Spontaneous Ultraweak Bioluminescence in Plants: Origin, Mechanisms and Properties},
author = {K Radotić and Č Radenović and M Jeremić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032249365&partnerID=40&md5=bb88ad4ec687f785dadd7b0e3c38b3d2},
year = {1998},
date = {1998-01-01},
journal = {General Physiology and Biophysics},
volume = {17},
number = {4},
pages = {289-308},
abstract = {An analysis of theoretical knowledge and experimental results of ultraweak luminescence (UWL) is provided. The role of excited state of molecules and free radicals, formed in various biochemical reactions, in UWL is discussed. UWL of model reactions and in vivo systems are compared. The hypothesis of coherent electromagnetic field as a source of UWL is also discussed. Spectral, kinetic and temporal properties of UWL are summarised, as well as their connection with its origin and role in the organism. Attention is paid to recent progress in experimental methods of low-light detection. The possible use of UWL in environmental studies, selection and other applications is discussed.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
An analysis of theoretical knowledge and experimental results of ultraweak luminescence (UWL) is provided. The role of excited state of molecules and free radicals, formed in various biochemical reactions, in UWL is discussed. UWL of model reactions and in vivo systems are compared. The hypothesis of coherent electromagnetic field as a source of UWL is also discussed. Spectral, kinetic and temporal properties of UWL are summarised, as well as their connection with its origin and role in the organism. Attention is paid to recent progress in experimental methods of low-light detection. The possible use of UWL in environmental studies, selection and other applications is discussed.
Petković, J; Minić, D; Korićanac, Z; Jovanović, T
Potentiometric determination of famotidine in pharmaceutical dosage forms Journal Article
In: Pharmazie, vol. 53, no. 3, pp. 163-164, 1998.
@article{Petković1998163,
title = {Potentiometric determination of famotidine in pharmaceutical dosage forms},
author = {J Petković and D Minić and Z Korićanac and T Jovanović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031822702&partnerID=40&md5=67090c754e8a3a220e781d0f928081fd},
year = {1998},
date = {1998-01-01},
journal = {Pharmazie},
volume = {53},
number = {3},
pages = {163-164},
abstract = {A simple and rapid method for the determination of famotidine is described. Famotidine is titrated with a solution of palladium(II)-chloride in Britton-Robinson buffer (pH = 3.60) using a silver indicator electrode. A stable yellow complex is formed. A significant step of the potential appears when the stoichiometric ratio of palladium(II) to famotidine is 1:1. The method is suitable for the determination of micro quantities (2.5-0.8 mg) of famotidine alone or in pharmaceutical dosage farms with a relative standard deviation of 0.7-2.3%.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A simple and rapid method for the determination of famotidine is described. Famotidine is titrated with a solution of palladium(II)-chloride in Britton-Robinson buffer (pH = 3.60) using a silver indicator electrode. A stable yellow complex is formed. A significant step of the potential appears when the stoichiometric ratio of palladium(II) to famotidine is 1:1. The method is suitable for the determination of micro quantities (2.5-0.8 mg) of famotidine alone or in pharmaceutical dosage farms with a relative standard deviation of 0.7-2.3%.
Malović, D; Vučelić, D
Application of thermal analysis for explaining the sorption of benzene and n-hexane on silicalite Journal Article
In: Journal of Thermal Analysis and Calorimetry, vol. 53, no. 3, pp. 835-842, 1998.
@article{Malović1998835,
title = {Application of thermal analysis for explaining the sorption of benzene and n-hexane on silicalite},
author = {D Malović and D Vučelić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032292594&doi=10.1023%2fA%3a1010194817066&partnerID=40&md5=38314f454e07db1b3ea3d5a57132ebee},
doi = {10.1023/A:1010194817066},
year = {1998},
date = {1998-01-01},
journal = {Journal of Thermal Analysis and Calorimetry},
volume = {53},
number = {3},
pages = {835-842},
abstract = {The origin of kinks (steps) on sorption isotherms was examined for the sorption of benzene and n-hexane on silicalite-1. In both cases sorption revealed the existence of two different binding sites. There was no equilibrium (or a very slow one), between molecules bound at different sites. Sorption energies within particular centres display more or less wide overlapping distributions leading to a single resultant isotherm. Depending on differences in binding energies and degree of overlapping, the resulting isotherms exhibit steps (benzene) or no steps (n-hexane). In fact, the sorption isotherm of benzene being a sum of two elemental isotherms (Ω1 and Ω2) of different shapes is characterized by a 'kink', in contrast to n-hexane the elemental isotherms of which are of the same shape.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The origin of kinks (steps) on sorption isotherms was examined for the sorption of benzene and n-hexane on silicalite-1. In both cases sorption revealed the existence of two different binding sites. There was no equilibrium (or a very slow one), between molecules bound at different sites. Sorption energies within particular centres display more or less wide overlapping distributions leading to a single resultant isotherm. Depending on differences in binding energies and degree of overlapping, the resulting isotherms exhibit steps (benzene) or no steps (n-hexane). In fact, the sorption isotherm of benzene being a sum of two elemental isotherms (Ω1 and Ω2) of different shapes is characterized by a 'kink', in contrast to n-hexane the elemental isotherms of which are of the same shape.
Schmidt, C; Perić, M; Mürtz, P; Wienkoop, M; Havenith, M; Urban, W
Faraday Laser Magnetic Resonance Spectroscopy of Vibrationally Excited C2D Journal Article
In: Journal of Molecular Spectroscopy, vol. 190, no. 1, pp. 112-124, 1998.
@article{Schmidt1998112,
title = {Faraday Laser Magnetic Resonance Spectroscopy of Vibrationally Excited C2D},
author = {C Schmidt and M Perić and P Mürtz and M Wienkoop and M Havenith and W Urban},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0011741228&doi=10.1006%2fjmsp.1998.7563&partnerID=40&md5=c296fdb9698f6f009ab9012f814bffdc},
doi = {10.1006/jmsp.1998.7563},
year = {1998},
date = {1998-01-01},
journal = {Journal of Molecular Spectroscopy},
volume = {190},
number = {1},
pages = {112-124},
abstract = {We studied the gas phase spectrum of the deuterated ethynyl radical C2D in the region between 3196 and 3243 cm-1 using a Faraday LMR spectrometer in combination with a CO overtone laser. The C2D radicals were generated in a dc glow discharge containing helium, deuterium, and acetylene. We observed a hot band between two vibronic 2Π states with an origin at 3225 cm-1. The lower level is assigned to the first excited bending level of the electronic X ground state. The upper level corresponds to the first excited electronic state A at 3513 cm-1, which was observed previously [J. Mol. Struct. 190, 41-60 (1988)]. This region is subject to strong vibronic interaction, caused by mixing of the electronic X ground state with the A state at 3513 cm-1. From the analysis of the spectra we could determine the orbital g factor of the upper level, which gave important information about the mixing ratios. In addition we were able to derive a precise term value for the first excited bending level of the electronic X ground state. The experimentally derived molecular parameters are compared with theoretically calculated values, obtained by ab initio calculations. © 1998 Academic Press.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We studied the gas phase spectrum of the deuterated ethynyl radical C2D in the region between 3196 and 3243 cm-1 using a Faraday LMR spectrometer in combination with a CO overtone laser. The C2D radicals were generated in a dc glow discharge containing helium, deuterium, and acetylene. We observed a hot band between two vibronic 2Π states with an origin at 3225 cm-1. The lower level is assigned to the first excited bending level of the electronic X ground state. The upper level corresponds to the first excited electronic state A at 3513 cm-1, which was observed previously [J. Mol. Struct. 190, 41-60 (1988)]. This region is subject to strong vibronic interaction, caused by mixing of the electronic X ground state with the A state at 3513 cm-1. From the analysis of the spectra we could determine the orbital g factor of the upper level, which gave important information about the mixing ratios. In addition we were able to derive a precise term value for the first excited bending level of the electronic X ground state. The experimentally derived molecular parameters are compared with theoretically calculated values, obtained by ab initio calculations. © 1998 Academic Press.
Mićić, M; Jovančićević, B; Polić, P; Šušić, N; Marković, D
In: Fresenius Environmental Bulletin, vol. 7, no. 11-12, pp. 648-653, 1998.
@article{Mićić1998648,
title = {Classification tools based on artificial neural networks for the purpose of identification of origin of organic matter and oil pollution in recent sediments},
author = {M Mićić and B Jovančićević and P Polić and N Šušić and D Marković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031729552&partnerID=40&md5=72b6fe68fe17bb2d918862c2c51b5902},
year = {1998},
date = {1998-01-01},
journal = {Fresenius Environmental Bulletin},
volume = {7},
number = {11-12},
pages = {648-653},
abstract = {The distinction between autochthonous, and oil-like origin of organic matter in geological sediments can be performed on the basis of n-alkane abundance and distribution patterns, determined by gas chromatography, or on the basis of the carbon-isotope ratio (δC13PDB) patterns of dominant n-alkanes, determined by gas chromatography-mass spectroscopy. Here we present solutions for automatic classification of organic matter origin in geological sediments, based on artificial neural networks.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The distinction between autochthonous, and oil-like origin of organic matter in geological sediments can be performed on the basis of n-alkane abundance and distribution patterns, determined by gas chromatography, or on the basis of the carbon-isotope ratio (δC13PDB) patterns of dominant n-alkanes, determined by gas chromatography-mass spectroscopy. Here we present solutions for automatic classification of organic matter origin in geological sediments, based on artificial neural networks.
Radotić, K; Todorović, S; Zakrzewska, J; Jeremić, M
In: Photochemistry and Photobiology, vol. 68, no. 5, pp. 703-709, 1998.
@article{Radotić1998703,
title = {Study of Photochemical Reactions of Coniferyl Alcohol. II. Comparative Structural Study of a Photochemical and Enzymatic Polymer of Coniferyl Alcohol},
author = {K Radotić and S Todorović and J Zakrzewska and M Jeremić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0000657138&doi=10.1111%2fj.1751-1097.1998.tb02533.x&partnerID=40&md5=0e92383443850678427aad92d5381440},
doi = {10.1111/j.1751-1097.1998.tb02533.x},
year = {1998},
date = {1998-01-01},
journal = {Photochemistry and Photobiology},
volume = {68},
number = {5},
pages = {703-709},
abstract = {The structure of the polymer synthesized by UV irradiation of coniferyl alcohol was studied, using UV-visible, Raman, IR, 1H-NMR and 13C-NMR spectroscopy. The photochemical polymer was compared with the structure of the polymer obtained by peroxidase-catalyzed polymerization of coniferyl alcohol. General similarity of the spectra of the two polymers was shown. However, differences in the fine structure of particular regions of the NMR spectra, as well as in certain bands in the Raman and IR spectra, could be explained through the various bond types and organization within the polymers. These results are consistent with molecular mass distribution of the polymers. Two fractions of enzymatic polymer correspond to the main two fractions of photochemical polymer. The later polymer has additional fractions that are probably the main reason for the observed spectral differences.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The structure of the polymer synthesized by UV irradiation of coniferyl alcohol was studied, using UV-visible, Raman, IR, 1H-NMR and 13C-NMR spectroscopy. The photochemical polymer was compared with the structure of the polymer obtained by peroxidase-catalyzed polymerization of coniferyl alcohol. General similarity of the spectra of the two polymers was shown. However, differences in the fine structure of particular regions of the NMR spectra, as well as in certain bands in the Raman and IR spectra, could be explained through the various bond types and organization within the polymers. These results are consistent with molecular mass distribution of the polymers. Two fractions of enzymatic polymer correspond to the main two fractions of photochemical polymer. The later polymer has additional fractions that are probably the main reason for the observed spectral differences.